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An Annotated List of Fishes from the River Niger at Malanville, Benin, with Notes on the Local Fisheries

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An Annotated List of Fishes from the River Niger at Malanville, Benin, with Notes on the Local Fisheries Verhandlungen der Gesellschaft für Ichthyologie Band 5, 2006, 95-110 An annotated list of fishes from the River Niger at Malanville, Benin, with notes on the local fisheries Eine kommentierte Liste der Fischarten vom Niger bei Malanville, Benin, mit Anmerkungen zur lokalen Fischerei Timo Moritz1, Philippe Lalèyè2, Grégoire Koba², and K. Eduard Linsenmair1 1Lehrstuhl für Tierökologie und Tropenbiologie, Theodor-Boveri-Institut, Am Hubland, Universität Würzburg, D-97074 Würzburg, Germany; [email protected] wuerzburg.de 2Laboratoire d’Hydrobiologie et d’Aquaculture, Faculté des Sciences agronomiques, Campus d’Abomey-Calavi, 01 BP 529 Cotonou, Bénin; [email protected] Summary: We investigated fish diversity in the Middle Niger river at Malanville, North-Eastern Benin. Catches recorded from fishermen add up to 65 species; additional own sampling using a small seine resulted in a list of 69 species. Overall 96 species from 21 families could be recorded. Rhabdalestes cf. smykalai, Brienomyrus brachyistius, Barbus nigeriensis and Pollimyrus adspersus were never recorded so far north. For 12 species we closed gaps in the distribution area, i.e. Hippopotamyrus psittacus, Mormyrops caballus, Raiamas senegalensis, Barbus baudoni, B. callipterus, B. leonensis, B. macinensis, B. punctitaeniatus, B. stygmatopygus, Nannocharax fasciatus, N. lineomaculatus and Andersonia leptura. We also recorded Synodontis levequei which was known so far only from the Konkouré basin in Guinea. In 2004 373 fishermen in Malanville used cast nets whith an average catch of 31 kg per fishing day; 1012 fishermen used gill nets with 17.4 kg, 472 traps with 17.7 kg and 618 long lines with 15 kg average catch per fishing day. We conclude that due to the high number of fishermen regulations for the utilisation of fish stocks are urgently needed to assure the conservation of the ichthyo- logical diversity and the future existence of the fishermen families of Malanville. Key words: fish diversity, sampling methods, West Africa, local fisheries Zusammenfassung: Wir untersuchten die Fischdiversität im mittleren Niger bei Malanville, Nord- ost Benin. In den Fängen von Fischern fanden sich 65 Arten; mit einem kleinen Zugnetz zusätzlich durchgeführte Fänge erbrachten 69 Arten. Insgesamt konnten wir 96 Arten aus 21 Familien nachwei- sen. Rhabdalestes cf. smykalai, Brienomyrus brachyistius Barbus nigeriensis und Pollimyrus adsperus wurden noch nie so weit nördlich gesammelt. Für 12 Arten konnten wir Lücken in den Verbreitungsgebieten schlie- ßen, im Einzelnen Hippopotamyrus psittacus, Mormyrops caballus, Raiamas senegalensis, Barbus baudoni, B. calli- pterus, B. leonensis, B. macinensis, B. punctitaeniatus, B. stygmatopygus, Nannocharax fasciatus, N. lineomaculatus und Andersonia leptura. Außerdem fanden wir Synodontis levequei, der bisher nur aus dem Konkouré Becken in Guinea bekannt war. Im Jahre 2004 benutzten 373 Fischer aus Malanville Wurfnetze mit einer durschnittlichen Ausbeute von 31 kg pro Arbeitstag; 1012 Fischer benutzten Kiemennetze mit 17.4 kg, 472 Reusen mit 17.7 kg und 618 Langleinen mit 15 kg durchschnittlichem Fang pro Arbeits- tag. Unsere Schlussfolgerung ist, dass wegen der großen Anzahl an Fischern Reglementierungen zur Nutzung der Fischbestände dringend erforderlich sind, um die Fischdiversität zu erhalten und den zukünftigen Lebensunterhalt der Fischerfamilien in Malanville zu sichern. Schlüsselwörter: Fischdiversität, Fangmethoden Westafrika, örtliche Fischerei Verh. Ges. Ichthyol. Bd. 5, 2006 95.
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